"The perfect heir to the throne, Elsa is a natural leader and loved by her kingdom. Regal and graceful, Elsa is everything a queen should be. But Elsa harbors a dark secret - she has the power to control ice and snow.

and:

"Elsa wants to protect Anna and others so she keeps her powers a secret. Since her powers are connected to her emotions, she seems cold, and detached. She avoids Anna which prohibits her from having any type of connection with her sister."